1 /* crypto/rand/randfile.c */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3 * All rights reserved.
4 *
5 * This package is an SSL implementation written
6 * by Eric Young (eay@cryptsoft.com).
7 * The implementation was written so as to conform with Netscapes SSL.
8 *
9 * This library is free for commercial and non-commercial use as long as
10 * the following conditions are aheared to. The following conditions
11 * apply to all code found in this distribution, be it the RC4, RSA,
12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
13 * included with this distribution is covered by the same copyright terms
14 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15 *
16 * Copyright remains Eric Young's, and as such any Copyright notices in
17 * the code are not to be removed.
18 * If this package is used in a product, Eric Young should be given attribution
19 * as the author of the parts of the library used.
20 * This can be in the form of a textual message at program startup or
21 * in documentation (online or textual) provided with the package.
22 *
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
25 * are met:
26 * 1. Redistributions of source code must retain the copyright
27 * notice, this list of conditions and the following disclaimer.
28 * 2. Redistributions in binary form must reproduce the above copyright
29 * notice, this list of conditions and the following disclaimer in the
30 * documentation and/or other materials provided with the distribution.
31 * 3. All advertising materials mentioning features or use of this software
32 * must display the following acknowledgement:
33 * "This product includes cryptographic software written by
34 * Eric Young (eay@cryptsoft.com)"
35 * The word 'cryptographic' can be left out if the rouines from the library
36 * being used are not cryptographic related :-).
37 * 4. If you include any Windows specific code (or a derivative thereof) from
38 * the apps directory (application code) you must include an acknowledgement:
39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40 *
41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51 * SUCH DAMAGE.
52 *
53 * The licence and distribution terms for any publically available version or
54 * derivative of this code cannot be changed. i.e. this code cannot simply be
55 * copied and put under another distribution licence
56 * [including the GNU Public Licence.]
57 */
58
59 /*
60 * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
61 * Use is subject to license terms.
62 */
63
64 #pragma ident "%Z%%M% %I% %E% SMI"
65
66 /* We need to define this to get macros like S_IFBLK and S_IFCHR */
67 #ifndef _BOOT
68 #define _XOPEN_SOURCE 500
69 #endif /* _BOOT */
70
71 #include <errno.h>
72 #include <stdio.h>
73 #include <stdlib.h>
74 #include <string.h>
75
76 #include "e_os.h"
77 #include <openssl/crypto.h>
78 #include <openssl/rand.h>
79 #include <openssl/buffer.h>
80
81 #ifdef OPENSSL_SYS_VMS
82 #include <unixio.h>
83 #endif
84 #ifndef NO_SYS_TYPES_H
85 # include <sys/types.h>
86 #endif
87 #ifdef MAC_OS_pre_X
88 # include <stat.h>
89 #else
90 # include <sys/stat.h>
91 #endif
92
93 #undef BUFSIZE
94 #define BUFSIZE 1024
95 #define RAND_DATA 1024
96
97 /* #define RFILE ".rnd" - defined in ../../e_os.h */
98
99 /* Note that these functions are intended for seed files only.
100 * Entropy devices and EGD sockets are handled in rand_unix.c */
101
RAND_load_file(const char * file,long bytes)102 int RAND_load_file(const char *file, long bytes)
103 {
104 /* If bytes >= 0, read up to 'bytes' bytes.
105 * if bytes == -1, read complete file. */
106
107 MS_STATIC unsigned char buf[BUFSIZE];
108 struct stat sb;
109 int i,ret=0,n;
110 FILE *in;
111
112 if (file == NULL) return(0);
113
114 i=stat(file,&sb);
115 /* If the state fails, put some crap in anyway */
116 RAND_add(&sb,sizeof(sb),0.0);
117 if (i < 0) return(0);
118 if (bytes == 0) return(ret);
119
120 in=fopen(file,"rb");
121 if (in == NULL) goto err;
122 #if defined(S_ISBLK) && defined(S_ISCHR)
123 if (S_ISBLK(sb.st_mode) || S_ISCHR(sb.st_mode)) {
124 /* this file is a device. we don't want read an infinite number
125 * of bytes from a random device, nor do we want to use buffered
126 * I/O because we will waste system entropy.
127 */
128 bytes = (bytes == -1) ? 2048 : bytes; /* ok, is 2048 enough? */
129 setvbuf(in, NULL, _IONBF, 0); /* don't do buffered reads */
130 }
131 #endif
132 for (;;)
133 {
134 if (bytes > 0)
135 n = (bytes < BUFSIZE)?(int)bytes:BUFSIZE;
136 else
137 n = BUFSIZE;
138 i=fread(buf,1,n,in);
139 if (i <= 0) break;
140 /* even if n != i, use the full array */
141 RAND_add(buf,n,(double)i);
142 ret+=i;
143 if (bytes > 0)
144 {
145 bytes-=n;
146 if (bytes <= 0) break;
147 }
148 }
149 fclose(in);
150 OPENSSL_cleanse(buf,BUFSIZE);
151 err:
152 return(ret);
153 }
154
RAND_write_file(const char * file)155 int RAND_write_file(const char *file)
156 {
157 unsigned char buf[BUFSIZE];
158 int i,ret=0,rand_err=0;
159 FILE *out = NULL;
160 int n;
161 struct stat sb;
162
163 i=stat(file,&sb);
164 if (i != -1) {
165 #if defined(S_ISBLK) && defined(S_ISCHR)
166 if (S_ISBLK(sb.st_mode) || S_ISCHR(sb.st_mode)) {
167 /* this file is a device. we don't write back to it.
168 * we "succeed" on the assumption this is some sort
169 * of random device. Otherwise attempting to write to
170 * and chmod the device causes problems.
171 */
172 return(1);
173 }
174 #endif
175 }
176
177 #if defined(O_CREAT) && !defined(OPENSSL_SYS_WIN32)
178 {
179 /* For some reason Win32 can't write to files created this way */
180
181 /* chmod(..., 0600) is too late to protect the file,
182 * permissions should be restrictive from the start */
183 int fd = open(file, O_CREAT, 0600);
184 if (fd != -1)
185 out = fdopen(fd, "wb");
186 }
187 #endif
188 if (out == NULL)
189 out = fopen(file,"wb");
190 if (out == NULL) goto err;
191
192 #ifndef NO_CHMOD
193 chmod(file,0600);
194 #endif
195 n=RAND_DATA;
196 for (;;)
197 {
198 i=(n > BUFSIZE)?BUFSIZE:n;
199 n-=BUFSIZE;
200 if (RAND_bytes(buf,i) <= 0)
201 rand_err=1;
202 i=fwrite(buf,1,i,out);
203 if (i <= 0)
204 {
205 ret=0;
206 break;
207 }
208 ret+=i;
209 if (n <= 0) break;
210 }
211 #ifdef OPENSSL_SYS_VMS
212 /* Try to delete older versions of the file, until there aren't
213 any */
214 {
215 char *tmpf;
216
217 tmpf = OPENSSL_malloc(strlen(file) + 4); /* to add ";-1" and a nul */
218 if (tmpf)
219 {
220 strcpy(tmpf, file);
221 strcat(tmpf, ";-1");
222 while(delete(tmpf) == 0)
223 ;
224 rename(file,";1"); /* Make sure it's version 1, or we
225 will reach the limit (32767) at
226 some point... */
227 }
228 }
229 #endif /* OPENSSL_SYS_VMS */
230
231 fclose(out);
232 OPENSSL_cleanse(buf,BUFSIZE);
233 err:
234 return (rand_err ? -1 : ret);
235 }
236
RAND_file_name(char * buf,size_t size)237 const char *RAND_file_name(char *buf, size_t size)
238 {
239 char *s=NULL;
240 int ok = 0;
241 #ifdef __OpenBSD__
242 struct stat sb;
243 #endif
244
245 if (OPENSSL_issetugid() == 0)
246 s=getenv("RANDFILE");
247 if (s != NULL && *s && strlen(s) + 1 < size)
248 {
249 if (BUF_strlcpy(buf,s,size) >= size)
250 return NULL;
251 }
252 else
253 {
254 if (OPENSSL_issetugid() == 0)
255 s=getenv("HOME");
256 #ifdef DEFAULT_HOME
257 if (s == NULL)
258 {
259 s = DEFAULT_HOME;
260 }
261 #endif
262 if (s && *s && strlen(s)+strlen(RFILE)+2 < size)
263 {
264 BUF_strlcpy(buf,s,size);
265 #ifndef OPENSSL_SYS_VMS
266 BUF_strlcat(buf,"/",size);
267 #endif
268 BUF_strlcat(buf,RFILE,size);
269 ok = 1;
270 }
271 else
272 buf[0] = '\0'; /* no file name */
273 }
274
275 #ifdef __OpenBSD__
276 /* given that all random loads just fail if the file can't be
277 * seen on a stat, we stat the file we're returning, if it
278 * fails, use /dev/arandom instead. this allows the user to
279 * use their own source for good random data, but defaults
280 * to something hopefully decent if that isn't available.
281 */
282
283 if (!ok)
284 if (BUF_strlcpy(buf,"/dev/arandom",size) >= size) {
285 return(NULL);
286 }
287 if (stat(buf,&sb) == -1)
288 if (BUF_strlcpy(buf,"/dev/arandom",size) >= size) {
289 return(NULL);
290 }
291
292 #endif
293 return(buf);
294 }
295